[RE-wrenches] max PV voltage in Canada

[Bill Brooks]

Jerry,

 

The Canadian requirements are simplistic and based on the 1996 and prior NEC. Canada is simply not keeping their code up to date and recognizing the fact that their western coast has significantly milder weather and that thin films do not have the same temperature coefficients as crystalline. I’m not sure they are enforcing this for all the big thin projects going on in Ontario however. These are engineered systems that are not required to follow the simplistic code requirements.

 

Bill.

 

 

From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jerry Caldwell
Sent: Monday, August 31, 2009 2:05 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] max PV voltage in Canada

 

Thank you Rob,
So instead of using specific weather data & temperature coefficients, they use one derate factor for the whole country?  Is the system maximum voltage 600V?

I found the following from a presentation online, but no quick easy answer for my question:

Voltage Rating [50-006]
• 50-006 Voltage Rating of Photovoltaic
Source Circuits
Voc x 125%
• Rated open circuit voltage
• Temperature affects Voc of modules.
• Based on ambient temperature of -40°C.

Best,
Jerry Caldwell

 

  _____  

From: Rob Harlan <mendosol at mcn.org>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Monday, August 31, 2009 12:27:15 PM
Subject: Re: [RE-wrenches] max PV voltage in Canada


Jerry,
This might address what you are asking: 
Rule # 50-006 of the Canadian Electrical Code increases the voltage rating of the photovoltaic source circuit by 25% above the STC rated open circuit voltage.  This would apply to the photovoltaic output circuits as well. 
Hope that helps,
Rob
Rob Harlan
Executive Director
Solar Energy Society of Canada
Northern Alberta Chapter
(780) 439-5608
office at solatalberta.ca




On 8/31/09 11:41 AM, "Jerry Caldwell" <solarcowboy at yahoo.com> wrote:

> Dear Wrenches,
> 
> Anyone know off the top of their head what the maximum PV array voltage is per 
> the Canadian Electric Code?  Are there any published voltage restrictions for 
> behind the fence installations (for Ontario in particular)?
> 
> Cheers,
> Jerry Caldwell
> 
> 
> 
>       
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